Vibration Studies of a Cantilevered Structure Subjected to Human Activities Using a Remote Monitoring System
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VIEW THE REPLYPublication: Journal of Performance of Constructed Facilities
Volume 25, Issue 2
Abstract
Long cantilevered balconies used as seating areas in auditoriums, theaters, churches, and stadiums are often susceptible to excessive vibrations because of crowd movements. Measurement and analysis of the responses of such structures when subjected to human movements can provide a reasonable estimate of their dynamic properties. However, it is generally very difficult to artificially excite such massive structures with a measured input force at the same level as that exerted by a crowd. In addition, it is not yet well understood how human occupants’ presence may change the dynamic properties of these structures. This paper presents details of a remote vibration monitoring system (RVMS) installed on a large cantilevered balcony structure to collect the vibration records generated by rhythmic crowd activities. The results of the studies conducted indicate that the presence of human occupants resulted in a consistent reduction in the natural frequencies of the structure and an increase in the damping ratios for higher modes. Conclusions were also drawn regarding the applicability of the damping ratios recommended by a number of standards and design guides for the structure used in this study.
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Acknowledgments
This study was supported by the National Science Foundation under the Grant No. NSFCMMI-0324471. This support is gratefully acknowledged. Any opinions, findings, and conclusions expressed in this paper are those of the author and do not necessarily reflect the views of the National Science Foundation.
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Published In
Journal of Performance of Constructed Facilities
Volume 25 • Issue 2 • April 2011
Pages: 87 - 97
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Aug 18, 2009
Accepted: Feb 3, 2010
Published online: Mar 15, 2011
Published in print: Apr 1, 2011
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